Fairchild FAN7842 service manual

FAN7842 High and Low Side Gate Driver

February 2007

Features

 Floating Channels Designed for Bootstrap Operation

to +200V

 Typically 350mA/650mA Sourcing/Sinking Current

Driving Capability for Both Channels

 Common-Mode dv/dt Noise Canceling Circuit  Extended Allowable Negative V

Signal Propagation at V

 V

& VBS Supply Range from 10V to 20V

CC

 UVLO Functions for Both Channels  TTL-Compatible Input Logic Threshold Levels  Matched Propagation Delay Below 50ns  Output In-phase with Input Signal

CC=VBS

Swing to -9.8V for

S

=15V

Applications

 Half- and Full-Bridge Converters  Current-Fed Push-Pull Converters  Synchronous Buck Converters

Description

The FAN7842, a monolithic high and low side gate drive IC, which can drive MOSFETs and IGBTs that operate up to +200V.

Fairchild’s high-voltage process and common-mode noise canceling technique provide stable operation of the high-side driver under high-dv/dt noise circumstances. An advanced level-shift circuit allows high-side gate driver operation up to V

The input logic level is compatible with standard TTLseries logic gates.

The UVLO circuits for both channels prevent malfunction when V

old voltage. Output driver current (source/sink) is typically 350mA/650mA, respectively.

and VBS are lower than the specified thresh-

CC

=-9.8V (typical) for VBS=15V.

S

8-SOP

Ordering Information

Part Number

FAN7842M

FAN7842MX

Note:

1. These devices passed wave soldering test by JESD22A-111.

FAN7842 Rev. 1.0.2

(1)

Operating Temp.

Range

-40°C to +125°CYes 8-SOP

Pb-Free Package Packing Method

Tube

Tape & Reel

Typical Application Diagrams

FAN7842 High and Low Side Gate Driver

15V

HIN

LIN

Internal Block Diagram

Up to 200V

D

R

V

1

CC

2

HIN

3

LIN

C1

COM

4

BOOT

HO

LO

V

8

B

7

V

6

S

5

R1

C

BOOT

R3

R2

R4

FAN7842 Rev.01

Figure 1. Application Circuit for Half-Bridge

Q1

Q2

Load

HIN

LIN

8

V

B

UVLO

GENERATOR

2

500K

HS(ON/OFF)

PULSE

NOISE

CANCELLER

UVLO

R

R S

DRIVER

7

HO

Q

V

6

S

1

V

CC

DRIVER

3

LS(ON/OFF)

500K

DELAY

FAN7842 Rev.02

LO

5

4

COM

Figure 2. Functional Block Diagram

FAN7842 Rev. 1.0.2 2

Pin Configuration

FAN7842 High and Low Side Gate Driver

V

HIN HO

LIN

COM

1

CC

2

3

4

FAN7842 Rev.01

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name Description

1VCCLow-Side Supply Voltage

2 HIN Logic Input for High-Side Gate Driver Output

3 LIN Logic Input for Low-Side Gate Driver Output

4 COM Logic Ground and Low-Side Driver Return

5 LO Low-Side Driver Output

6V

7 HO High-Side Driver Output

8V

S

B

High Voltage Floating Supply Return

High-Side Floating Supply

8

V

B

7

6

V

S

5

LO

FAN7842 Rev. 1.0.2 3

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The

absolute maximum ratings are stress ratings only. TA=25°C unless otherwise specified.

Symbol Parameter Min. Max. Unit

V

S

V

B

V

HO

V

CC

V

LO

V

IN

COM Logic ground V

dVs/dt Allowable offset voltage slew rate 50 V/ns

(2)(3)(4)

P

D

θ

JA

T

J

T

STG

Note:

2. Mounted on 76.2 x 114.3 x 1.6mm PCB (FR-4 glass epoxy material).

3. Refer to the following standards: JESD51-2: Integral circuits thermal test method environmental conditions - natural convection JESD51-3: Low effective thermal conductivity test board for leaded surface mount packages

4. Do not exceed P

High-side offset voltage VB-25 VB+0.3

High-side floating supply voltage -0.3 225

High-side floating output voltage HO VS-0.3 VB+0.3

Low-side and logic fixed supply voltage -0.3 25

V

Low-side output voltage LO -0.3 VCC+0.3

Logic input voltage (HIN, LIN) -0.3 VCC+0.3

-25 VCC+0.3

CC

Power dissipation 0.625 W

Thermal resistance, junction-to-ambient 200 °C/W

Junction temperature 150 °C

Storage temperature 150 °C

under any circumstances.

D

FAN7842 High and Low Side Gate Driver

Recommended Operating Ratings

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings.

Symbol Parameter Min. Max. Unit

V

B

V

S

V

HO

V

LO

V

IN

V

CC

T

A

High-side floating supply voltage VS+10 VS+20

High-side floating supply offset voltage 6-V

High-side (HO) output voltage V

CC

S

Low-side (LO) output voltage COM V

Logic input voltage (HIN, LIN) COM V

200

V

CC

B

V

Low-side supply voltage 10 20

Ambient temperature -40 125 °C

FAN7842 Rev. 1.0.2 4